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revert a committed change in SVN
This command can be used to revert a particular changeset in the local copy. I find this useful because I frequently import files into the wrong directory. After the import it says "Committed revision 123" or similar. to revert this change in the working copy do: svn merge -c -123 . (don't forget the .) and then commit.

Command to logout all the users in one command
This command logs out all users - which is way more secure to use ps -ef and "grep" to kill processes. Never ever use ps -ef piped to grep to kill something. If you ever need to ps-something use the UNIX95-directive, which makes sure you will never need "grep" together with "ps".

Convert string to uppercase

Generate 10 pronunciable passwords
A great password generation tool. http://www.adel.nursat.kz/apg/

Find the package that installed a command

Retrieve the size of a file on a server
Downloads the entire file, but http servers don't always provide the optional 'Content-Length:' header, and ftp/gopher/dict/etc servers don't provide a filesize header at all.

Get information about memory modules
To take information about the characteristics of the installed memory modules.

Use the arguments used in the last command
Very basic, but who knows.. mkdir !$ should work too, only uses 'the last' argument. !-2 executes cd Desktop/Notes again. More tips in 'man history'

Make vim open in tabs by default (save to .profile)
I always add this to my .profile rc so I can do things like: "vim *.c" and the files are opened in tabs.

yum -q list updates | tail -n+2


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